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常用加解密工具类(MD5、SHA、DES、AES、RSA)

来源:phpxs 发布时间:2016-01-22 阅读次数:
  解密工具类,实现了常用的加解密类。包括单向加密:MD5、SHA;对称加密:DES、AES;非对称加密:RSA   完整代码见:https://git.oschina.net/bayern.com/SecureUtils.git  同时提供ant打包脚本。

  下面展示部分关键代码

MD5 单向加密: /** * 返回MD5单向加密后的十六进制字符串 * @param data * @return * @throws Exception */ public String getEncryptForHex(byte[] data) throws Exception { byte[] digestData = encrypt(data); StringBuffer hex = new StringBuffer(); for(int i = 0; i < digestData.length; i++) { int h = ((int)digestData[i]) & 0XFF; if(h < 16) { hex.append("0"); } hex.append(Integer.toHexString(h)); } return hex.toString(); } DES 对称加密类: @Override public byte[] encrypt(byte[] data) throws Exception { if(secretKey == null || "".equals(secretKey)) { throw new Exception("scretKey need to exists"); } SecretKey md5Key = getKey(secretKey); Cipher cipher = Cipher.getInstance(ALGORITHM); cipher.init(Cipher.ENCRYPT_MODE, md5Key); return cipher.doFinal(data); } @Override public byte[] decrypt(byte[] data) throws Exception { if(secretKey == null || "".equals(secretKey)) { throw new Exception("scretKey need to exists"); } SecretKey md5Key = getKey(secretKey); Cipher cipher = Cipher.getInstance(ALGORITHM); cipher.init(Cipher.DECRYPT_MODE, md5Key); return cipher.doFinal(data); } RSA 非对称加密。私钥加密 & 私钥解密 & 私钥签名 @Override public byte[] encrypt(byte[] data) throws Exception { PrivateKey rsaPrivateKey = getRSAPrivateKey(); Cipher cipher = Cipher.getInstance(ALGORITHM); cipher.init(Cipher.ENCRYPT_MODE, rsaPrivateKey); return cipher.doFinal(data); } @Override public byte[] decrypt(byte[] data) throws Exception { PrivateKey rsaPrivateKey = getRSAPrivateKey(); Cipher cipher = Cipher.getInstance(ALGORITHM); cipher.init(Cipher.DECRYPT_MODE, rsaPrivateKey); return cipher.update(data); } /** * 使用私钥 对数据进行签名 * @param data * @return * @throws Exception */ public String sign(byte[] data) throws Exception { PrivateKey rsaPrivateKey = getRSAPrivateKey(); Signature signature = Signature.getInstance(SIGN_ALGORITHM); signature.initSign(rsaPrivateKey); signature.update(data); return encoder(signature.sign()); } RSA 非对称加密。公钥加密 & 公钥解密 & 公钥校验签名 @Override public byte[] encrypt(byte[] data) throws Exception { if(publicKey == null || "".equals(publicKey)) { throw new Exception("publicKey is need exists"); } PublicKey rsaPublicKey = getRSAPublicKey(publicKey); Cipher cipher = Cipher.getInstance(ALGORITHM); cipher.init(Cipher.ENCRYPT_MODE, rsaPublicKey); return cipher.doFinal(data); } @Override public byte[] decrypt(byte[] data) throws Exception { if(publicKey == null || "".equals(publicKey)) { throw new Exception("publicKey is need exists"); } PublicKey rsaPublicKey = getRSAPublicKey(publicKey); Cipher cipher = Cipher.getInstance(ALGORITHM); cipher.init(Cipher.DECRYPT_MODE, rsaPublicKey); return cipher.doFinal(data); } /** * 使用公钥校验签名 * @param data * @param sign * @return * @throws Exception */ public boolean verifySign(byte[] data, String sign) throws Exception { if(publicKey == null || "".equals(publicKey)) { throw new Exception("publicKey is need exists"); } PublicKey rsaPublicKey = getRSAPublicKey(publicKey); Signature signature = Signature.getInstance(SIGN_ALGORITHM); signature.initVerify(rsaPublicKey); signature.update(data); return signature.verify(decoder(sign)); }
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